CN108137299B

CN108137299B - Pumping machine with electromechanical lifting system

Info

Publication number: CN108137299B
Application number: CN201680060104.9A
Authority: CN
Inventors: 卡梅洛·玛瑞尔
Original assignee: Dimaco Sas Di Marrale Carmelo & C
Current assignee: Dimaco Sas Di Marrale Carmelo & C
Priority date: 2015-10-13
Filing date: 2016-10-06
Publication date: 2020-03-17
Anticipated expiration: 2036-10-06
Also published as: BR112018007431B1; MX2018004236A; CN108137299A; WO2017064596A1; HRP20200218T1; EP3362401B1; US20180290869A1; US10875751B2; EP3362401A1; PL3362401T3; BR112018007431A2; ITUB20154647A1; EA201890927A1; EA033870B1

Abstract

The pumping machine (650, 750) comprises: at least two tubular elements (651, 751) containing pressurized gas and extending in parallel in a vertical direction and interconnected between them by means of connecting elements (652, 752); and an electromechanical lifting system (600, 700), comprising: a first cylinder (601, 701), the first cylinder (601, 701) being interconnected to the tubular element (651, 751) and comprising a substance compressible by the piston (601b, 701 b); and a screw (602, 702) having a vertical axis Y coinciding with the axis of the pumping machine (650, 750). The screw (602, 702) is inserted in a second thrust cylinder (658, 758) connected in a sliding manner inside the first cylinder (601, 701), having a first end (602b, 702b) fixed to the connecting element (602, 702) and a second end (602a, 702a) configured for sliding inside the thrust cylinder (658, 758) and covering a chamber (605, 705) comprising lubricating and cooling oil covering the piston (601b, 701 b).

Description

Pumping machine with electromechanical lifting system

Technical Field

The present invention relates to a pumping machine.

In particular, the invention relates to a pumping machine of the type having an electromechanical lifting system for lifting a load.

Background

As is well known, a pumping machine is a working machine that uses mechanical handling components (rotary or linear motion) to lift or otherwise move or collect fluid material. This type of pump is suitable for taking water from a well having a considerable depth. Cylinders, such as hydraulic cylinders, are commonly used in the mechanical components of such machines to utilize the pressure of the fluid supplied by the pump for transmitting force. These hydraulic or pneumatic cylinders have the advantage of being simple and economical in construction, accumulating and reusing energy by means of special pressure vessels, but only when the requirements of their application on repeatability of operating speed and low positioning accuracy are low.

In contrast, mechanical cylinders based on the use of fluid pressure require very expensive units to produce, control and dispense pressurized fluid when the application requires high force control, speed and positioning.

Therefore, in these cases, in general, it is preferable to use an electronically controlled motion transmission system which ensures a high degree of control over speed and positioning.

However, it is difficult for electrical systems to accumulate energy and efficiently reuse the energy.

A solution to this problem is proposed in patent application ITCZ20140007 filed 4/14/2014, assigned to DIMACOSAS, which describes an electromechanical load lifting system comprising: a cylinder including a screw connected to a load, the screw being vertically movable to descend and ascend; a motor connected to one end of the cylinder; and means for converting the rotary motion imparted by the motor into a translational motion of the screw. The cylinder also includes a canister filled with a compressible gas and a piston connected to one end of the screw. When the screw is directed towards the tank, substantially the translational movement of the screw allows the piston to transfer energy to the gas of the tank, and when directed in the opposite direction, substantially the translational movement of the screw allows the piston to transfer energy from the gas of the tank to the screw. Furthermore, as shown in fig. 1, it describes a surface machine for the artificial lifting of oil from a subsoil well by means of a pumping rod comprising a lifting system and comprising two tubular elements extending vertically between and parallel to them, containing pressurized gas, interconnected at the top by a support and fixed at the bottom on a supporting frame. The tubular element laterally comprises sliding and anti-rotation guides to which the screw of the electromechanical lifting system is coupled by means of a shaft rigidly connected to the end of the screw, at the end of which sliding means are incorporated for sliding on the guides, and rolling means for supporting the cables connecting the machine to the well pumping rods.

Although convenient in several respects, particularly in terms of energy efficiency, the machine has a problem of limited efficiency due to the fact that the load of the gas and the engine affects both the motor nut and the screw. Such overloading of the nut will lead to overheating and thus premature ageing.

Furthermore, since the screw is subjected to the full load, its length and hence its effective stroke needs to be limited. For these reasons, the machines of the previous patent applications of the applicant are neither able to lift large loads nor have a sufficiently long service life.

Disclosure of Invention

The scope of the present invention is to provide a pumping machine of the type comprising an electromechanical lifting system, which is capable of lifting at least twice the heavy load for the same screw diameter, as compared with the previous patent application of the same applicant, obtaining a longer service life of at least three times or more as compared with the previous patent application of the same applicant, and therefore having characteristics exceeding the limits of the machines still previously described with reference to the known art.

According to the present invention, there is provided a pumping machine as claimed in claim 1.

For a better understanding of the present invention, preferred embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:

drawings

Figure 1 shows a schematic view and an enlarged detail of a specific part of a pumping machine according to the prior art;

figure 2 shows a first schematic view of the upper part of a first embodiment of a pumping machine according to the invention and an enlarged detail thereof;

figure 3 shows a second schematic view of the upper part of the first embodiment of the pumping machine according to the present invention;

figure 4 shows a top view of the upper part of a first embodiment of a pumping machine according to the invention;

figure 5 shows a schematic cross-sectional view of the lower end of the screw of the first embodiment of the pumping machine according to the present invention;

figure 6 shows a cross-sectional view of a first embodiment of a pumping machine according to the present invention;

figure 7 shows a schematic view of the motor of the pumping machine according to the present invention;

figure 8 shows a schematic view of a cover system incorporating a screw in the upper part of a first embodiment of a pumping machine according to the present invention;

FIG. 9A FIG. 9B shows front and side views of a first embodiment of a pumping machine according to the present invention in a start-up configuration;

FIG. 10A FIG. 10B shows front and side views of a first embodiment of a pumping machine according to the present invention in a final operating configuration;

fig. 11 shows a schematic cross-sectional view of a first embodiment of a pumping machine according to the invention with a representation of the forces involved.

Figure 12 shows a cross-sectional view of a second embodiment of a pumping machine according to the invention.

Detailed Description

With reference to these figures, and in particular to figures 2 and 3, a pumping machine according to the present invention is shown. In more detail, the first embodiment of the pumping machine 650 comprises two tubular elements 651, extending vertically and parallel to each other, serving as a reservoir or accumulator of gas under pressure, for example nitrogen or a mixture of air and nitrogen, inserted through suitable valves, not shown in the figures. The tubular elements 651 are interconnected to each other at the top by a connecting element 652 (e.g., a bracket) and are secured to a support structure (e.g., a pedestal) shown in fig. 4 at the bottom. The machine 650 further comprises a rolling device 655, the rolling device 655 being for example a pulley adapted to support a cable for lifting a load, the rolling device 655 being attached to a sliding device 657 sliding in a guide 653, the guide 653 extending inside the tubular element 651 and along the tubular element 651 for a predetermined length.

Furthermore, the machine 650 comprises an electromechanical lifting system 600 between two tubular elements 651, which electromechanical lifting system 600 comprises a first cylinder 601, the tubular elements 651 being interconnected with the first cylinder 601 via connecting elements 663 and flexible hoses allowing gas to pass between the tubular elements 651 and the cylinder 601. In this way, the cylinder 601 is filled with a compressible gas from the tubular element 651 and comprises a piston 601b configured to compress the gas. The electromechanical lift system 600 further includes a threaded rod 602, an end 602a of the threaded rod 602 being inserted inside a second thrust cylinder 658, the second thrust cylinder 658 being connected in a sliding manner to the inner wall of the first cylinder 601 at the lower end of the threaded rod.

Advantageously, according to the invention, the gas load is transmitted to the pulleys of the machine only via the thrust cylinder 658.

The lower part of the thrust cylinder 658 inserted inside the first cylinder 601 houses a chamber 605, the chamber 605 collecting lubricating and cooling oil for lubricating and cooling the inside of the nut 603b, the screw 602 and the thrust cylinder 658, in particular in the first embodiment of the machine, the thrust cylinder 658 comprises a lower support 660 configured to limit the vibrations and the bending of the free end of the screw, as shown in figure 2. In addition, the thrust cylinder 658 includes a suction tube 665 for sucking oil contained in the chamber 605, as shown in fig. 2, or alternatively outside the chamber.

As shown in fig. 4, the screw 602 has a first end 602b, the first end 602b being secured to the connecting member 652 by a first locking member, for example, comprising a locking hub 661 and a first ring 659 b.

Furthermore, as shown in fig. 5, according to one aspect of the invention, in the inverted image of the cylinder 601, the screw has a second free end 602a, as shown in fig. 2, which second free end 602a is connected by means of a second locking element (for example a second ring 659a) to a support 660, for example made of steel, which support 660 slides inside the thrust cylinder 658 and covers the chamber 605 comprising the lubricating and cooling oil.

Advantageously according to the invention, the sliding support 660 allows the screw 602 to be guided and to be able to operate for a long time.

Advantageously according to the invention, the intake chamber 605 is able to accumulate the oil sucked by the pump 664 shown in fig. 6, allowing to lubricate and cool the nut 603b and to lubricate the support 660 acting as a bottom guide for the screw.

According to one aspect of the invention, the screw 602 is a ball screw, a roller screw, or a planetary roller screw, or a hydrostatic screw.

The machine 600 also comprises a motor 603, better shown in fig. 7, the motor 603 having a stator supported by a carriage 603a, the carriage 603a also serving as a head for supporting the pulley 655, the stator being fixed to a slide 657, the slide 657 sliding in a guide 653 placed on the inner wall of the tubular element 651. In addition, motor 603 includes a nut 603b, nut 603b being a recirculating ball and/or roller (roller) or hydrostatic nut, and nut 603b being flanged to the rotor of motor 603 that rotates about screw 602, or alternatively being part of the motor itself.

Advantageously according to the invention, an encoder, not shown in the figures, is arranged on the motor 603 to indicate the position of the motor 603 to a control system, not shown in the figures. In addition, the motor 603 includes additional stroke safety sensors and feedback sensors, not shown, to feedback the position, speed and acceleration of the thrust cylinder 658. The control system is configured to continuously monitor the performance of the pumping machine and react to variable loading of the lift rods and various environmental conditions.

Advantageously according to the invention, an oil pump 664 configured to lubricate and cool the nut and the screw is placed in the head 603 a. The oil pump 664 is also configured to lubricate the interior of the thrust cylinder 658 and the sliding device 660 when present.

All moving parts of the machine are lubricated and cooled by heat exchangers not shown in the figures to ensure efficiency and function.

Advantageously according to the invention, the gas balance of the weight of the pumping rod (the rod being the longest and heaviest the deeper the well) lifted from the machine by the cable on the pulley can be simply adjusted by acting on the gas pressure in the accumulator.

As shown in fig. 8, the machine 650 also includes a cover system for the screw 602. More precisely, the screw-cap system 602 comprises two sliding plates 662, which slide on internal guides, not shown in the figures, and a fixed plate 663, which is arranged transversely to the screw 602, the fixed plate 663 acting as a front and rear cover for the screw 602.

Advantageously according to the invention, the screw cap system 602 also protects the motor 603, the suspension 665 with flexible hose, the lubrication pump 664 and all the sensors present.

As shown in fig. 9, in use, in an initial configuration, the machine 650 has a pulley 655 at a lower portion of the machine 650. In this configuration, the gas is contained in a tubular element 651 communicating with the first cylinder 601 and from here pushes the piston 601b and the internal tube 658 fixed thereto, relieving the load to be lifted by means of the motor 603. Thus, the pulley 655 is pushed to increase the degree of load reduction, and the cable is hooked to the pulley 655. Subsequently, the motor 603 rotates the nut 603b that drives the load. The motor 603 then performs a rising climb, followed by a decelerating climb to reach the upper part of the machine 650. In this position shown in fig. 10, the motor 603 makes a U-turn and causes the screw 602 to compress the gas with the aid of the load. Thus, the gas acts as a balancing element for the motor, allowing energy savings to be achieved.

As shown in fig. 11, advantageously according to the invention, during the ascending movement along the Y-axis of the screw 602 (also the operating axis of the machine 600), the action of the electric motor 603 is transmitted to the pulley 655 of the machine 605 interconnected with the head 605a only by means of the torque transmitted to the nut 603b, the nut 603b being a circulating ball and/or roller or hydrostatic nut, which in turn rotates around the screw 602, thus converting the rotary movement into a rectilinear movement along the Y-axis. In particular, the left diagram of fig. 11 shows the distribution of the force exerted by the motor, and the right diagram shows the distribution of the force exerted by the gas. Thus, it is clear that not all the force actions of the engine and the gas are transmitted to the nut, but follow two different paths.

Advantageously, according to the invention, during the lowering movement along the Y axis, the action of the electric motor 603 is transmitted to the gas. In fact, piston 601b is actuated by thrust cylinder 658, which is located at a lower position with respect to head 603a, only by the torque transmitted to nut 603b, which in turn rotates nut 603b about screw 602, thereby converting the rotary motion into linear motion along the Y-axis.

According to one aspect of the invention, as shown in fig. 12, the machine 750 comprises oil instead of gas inside a cylinder 701, said cylinder 701 communicating with the lower part of the tubular element 751 containing oil, a separator floating piston 761 being located inside the cylinder 701. The piston 761 is configured to separate oil from gas contained in the upper portion of the tubular element 751.

According to another aspect of the invention, the tubular element 751 is not provided with a separator floating piston, in which case the separation between gas and oil is performed using two different physical states, liquid/gas.

The pumping machine according to the invention therefore allows to lift higher loads compared to the machines of the applicant's previous patent applications.

Another advantage of the pumping machine according to the invention is its increased lifetime.

Another advantage of the pumping machine according to the invention is that by means of the oil lubrication, which also acts as a cooling, it is possible to monitor the operating conditions using suitable sensors on the fluid.

Furthermore, the pumping machine according to the invention allows to obtain precise treatments.

Another advantage of the pumping machine according to the invention is the increased operating speed.

Finally, the pumping machine according to the invention has a low noise level.

Finally, it is clear that the pumping machine described and illustrated herein is capable of modifications and variations, without thereby departing from the scope of protection of the present invention, as defined in the annexed claims.

Claims

1. A pumping machine (650, 750) comprising:

at least two tubular elements (651, 751) containing pressurized gas and extending in parallel in a vertical direction, interconnected between them by means of connecting elements (652, 752); and

an electromechanical lifting system (600, 700), comprising: a first cylinder (601, 701), said first cylinder (601, 701) being interconnected with said tubular element (651, 751) and comprising a substance compressible by a piston (601b, 701 b); and a screw (602, 702) having a vertical axis Y coinciding with the axis of the pumping machine (650, 750);

characterized in that said screw (602, 702) is inserted in a second thrust cylinder (658, 758), said second thrust cylinder (658, 758) being slidingly connected in said first cylinder (601, 701), said screw (602, 702) having a first end (602b, 702b) and a second end (602a, 702a), said first end (602b, 702b) being fixed to said connecting element (652, 752), said second end (602a, 702a) being configured to slide in said second thrust cylinder (658, 758) and covering a chamber (605, 705), said chamber (605, 705) comprising a lubricating and cooling oil covering said piston (601b, 701 b).

2. Pumping machine (650, 750) according to claim 1, characterized in that said screw (602, 702) is a recirculating ball screw, or a planetary roller screw, or a hydrostatic screw.

3. Pumping machine (650, 750) according to claim 1, characterized in that said first end (602b) is fixed to said connection element (652) by first locking means (661, 659 b).

4. Pumping machine (650, 750) according to claim 1, characterized in that said pumping machine (650, 750) comprises a suction duct (665, 765) of the oil contained in said chamber (605, 705).

5. Pumping machine (650, 750) according to claim 1, characterized in that said pumping machine (650, 750) comprises an electric motor (603, 703), said electric motor (603, 703) being able to be raised and lowered along said screw (602, 702) and comprising a stator, being a circulating ball nut and/or a roller nut or a hydrostatic nut, and a nut member (603b, 703b), said stator being supported by a head (603a, 703a) for holding a pulley (655, 755) and being fixed to sliding means (657, 757), said sliding means (657, 757) being configured for sliding inside a guide (653, 753) on an inner wall of said tubular element (651, 751).

6. Pumping machine (650, 750) according to claim 5, characterized in that said nut member (603b, 703b) is connected to a rotor flange of said electric motor (603, 703) rotating around said screw (602, 702) or is integrated to said electric motor (603, 703).

7. Pumping machine (650, 750) according to claim 5, characterized in that said pumping machine (650, 750) comprises a cover system for covering said screw (602), said cover system being configured to protect said screw (602) and said electric motor (603).

8. Pumping machine (650, 750) according to any one of the preceding claims, characterized in that said second end (602a, 702a) is free.

9. Pumping machine (650, 750) according to claim 8, characterized in that said second end (602a) is connected to a support (660) by means of second locking means (659a), said support (660) covering said cavity (605) and being configured to slide inside said second thrust cylinder (658).

10. Pumping machine (650) according to claim 1, characterized in that said substance compressible by the piston (601b, 701b) is a gas or an oil.

11. Pumping machine (650) according to claim 1, characterized in that said tubular elements (651, 751) contain a pressurized gas in their upper part and an oil in their lower part.

12. Pumping machine (650) according to claim 11, characterized in that said tubular element (751) comprises a floating separator piston (761) configured to separate oil from gas.

13. The pumping machine (650) of claim 1, wherein the screws (602, 702) are reverse planetary roller screws.